CODEWITHSUNDEEP
phparraysif-statementfor-loop
stack
stack

Reputation: 10228

How to remove all items of array except specific one?

I have a variable which is containing these nested arrays:

echo $var;

/* Output:
Array(
       [0] => Array
         (
             [id] => 1
             [box] => 0
         )

       [2] => Array
         (
             [id] => 2
             [box] => 0
         )

       [3] => Array
         (
             [id] => 3
             [box] => 1
         )
) */

Now I want to remove all items of array above except $numb = 2; (the value of id). I mean I want this output:

echo newvar;

/* Output:
Array(
       [2] => Array
         (
             [id] => 2
             [box] => 0
         )
) */

How can I do that?

Actually I can do a part of it by using if statement and array_shift() function:

foreach($var as $key => $val) {
    if($val["id"] != 2) {
        array_shift($var);
    }
}

But the output of code above isn't want I need.

Upvotes: 0

Views: 8932

Answers (4)

mferly
mferly

Reputation: 1656

array_reduce() would also do the job:

$array = [
    ['id' => 1, 'box' => 0],
    ['id' => 2, 'box' => 0],
    ['id' => 3, 'box' => 1]
];
$id = 2;
$result = array_reduce ($array, function ($carry, $item) use ($id) {
    if ( $item['id'] === $id )
        $carry[$item['id']] = $item;
    return $carry;
}, []);

Upvotes: 1

Don't Panic
Don't Panic

Reputation: 41820

You can use a slightly different loop.

foreach ($var as $item) {
    if ($item['id'] == 2) {
        $newvar = $item;
        break;
    }
}

You could also use array_filter

$id = 2;
$newvar = array_filter($var, function($x) use ($id) { return $x['id'] == $id; });

but it would most likely be less efficient as it would have to check every element of the array.

Upvotes: 3

Hannele
Hannele

Reputation: 9676

You could just make a new array:

$oldArray = array(0 => 'a', 1 => 'b', 2 => 'c', 3=> 'd');

$index = 2;
$newArray = array($index => $oldArray[$index]);

// or even
$newArray = [$index => $oldArray[$index]];

If you don't need to preserve the index you can just do:

$newArray = [$oldArray[$index]];

Upvotes: 1

catbadger
catbadger

Reputation: 1832

I'm wondering how much context would help us with answering your question... Here is an answer to what you asked:

$newArray = array($var[2]);

Upvotes: 5

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